Process of forming hoods and aprons for ventilators



w. REENSTROM. PROCESS OF FORMING HO ODS AND 'APRONS FOR VENTILATORS.

rum/mo" man IULYM, 1919. 1,424,945.

Patented Aug. 8, 1922.

I I I 5 6'? 3 1. PF? a E i is ii i i (a. a. is, n it was and n .i. den 3) WALTER REENS'IROh/I, OF CHICAGO, ILLINOIS.

PROCESS O13 FORMING HOODS AND AIHPRDNS FOR VENTILATORS.

istens.

Original application-filed May 31,

tain new and useful Process of Forming.

Hoods and Aprons for Ventilators,-of which the following is a specification.

My invention relates to a process for forming hoods and aprons for ventilators designed for use upon house-tops and the like, whereby the same are easily and economically manufactured, waste of material being reduced to a minimum, the present application being a division of my application for ventilators, filed May 31, 1917, Serial No. 172,016.

Other objects will appear hereinafter.

The invention will be best understood by reference to the accompanying drawings forming a part of this specification, and in which,

Fig. 1 is a top plan View of hood formino' sections.

Fig. 2 is a top plan View of a sheet-metal blank, illustrating the method of cutting the same in the formation of the hood and aprons embodied in the ventilator.

Fig. 3 is a vertical sectional view of a. ventilator embodying my invention.

Fig. 4 is a top plan View of a sheet used in the ventilator.

Fig. 5 is a transverse sectional view of the device shown in F ig. 3.

The preferred form of construction, as illustrated in the drawing, comprises an outer tubular member consisting of a plurality of telescopic tubular sections 6. Said sections are rigidly connected at their points of overlapping by rivets 6. Arranged within said tubular member is a plurality of spaced, longitudinally extending reinforcing bars or straps 7, which are rigidly connected with the sections 6 by the before mentioned rivets 6. The upper end portions of bars 7 are rigidly connected with the upper edge portion of the uppermost section 6 by rivets 7 Arranged at and spaced directly over the upper end of said tubular member is a conical hood, which is supported by the upper ends of bars 7, which are extended upwardly in order to constitute supports therefor. The hood is formed of two semi-circular sections 8 and 8, the edges of which are overlapped,

Specification of Letters Patent.

Patented ling. 8, 1922.

1917, Serial No. 172,016. Divided and this application filed July. 14,

1919. Serial No. 310,633.

said edges, being notched as at 9 to allow aforesaid overlapping, as clearly seen in Fig. 1. Said overlapping edge portions of said hood sections are rigidly secured together by rivets 9. it will be noticed in Fig. 1 that the section 8 overlaps the section 8 for .a distance equal to one half of the diameter and underlaps section 8 a similar distance.

Arranged'at the upper edge of each section 6 is an annular downwardly and outwardly inclined apron 10, secured to said sections by means of the rivets T and 6. @penings 11 are formed at the upper ends of each section 6 below the aprons 10 through notching or cutting away the upper edge portions of said sections, as clearly seen in Fig. 3 and Fig. i. The openings 11 do not extend below the lower edges of the aprons 10, this arrangement precluding a direct draft into said openings, which would otherwise result did said openings extend below the lower edges of said aprons.

In the manufacture of the hood composed of the sections 8 and 8, and in the manufacture of the aprons 10, a rectangular flat blank of sheet metal is employed, as seen in Fig. 2. Said blank is cut along two spaced concentric lines 12 and 13, one half of the hood being formed by the semi-circular portion within the line 12, and one half of one of the aprons being formed by the arcuate strip 10 which is included between the lines 12 and 13. With this process or method of construction, only the corner portions ll will be wasted. concentrically arranged within the tubular member of the ventilator is a smaller pipe 15 rigidly held in position by means of arms 16. The upper end of pipe 15 is closed and provided with lateral openings 17, said openings 17 being preferably arranged in substantially the same horizontal plane as the lowermost openings 17. The tubular pipe made up of the sections 6 which surround the pipe 15 is prolonged at the lower end, so as to allow both it and the pipe 15 to pass into and communicate with the interior of the building with which. the device is used, for ventilating purposes.

A. ventilator of the construction set forth is extremely strong and durable and may be manufactured at a low cost, particularly due to the method of forming the constituent parts of the hood.

Nhile I have illustrated and described the preferrediorin of construction for carrying my invention into effect, this is capable of variation and modification Without departing from the spirit of the invention. 1, thereforerdo not Wish to be liinited to the precise details of the construction set forth, but desire to avail myself of such variations and modifications as come Withinthe scope of the appended claim. c

Having described my invention, What I claim as new and desire to secure by Letters Patent, is:

A method of making ventilator parts from separate sections by cutting blanks for hall? a hood and half an apron, said blanks being I cut from the same piece of material by cutting along two concentric lines having diameters coincident with one of the edges of the piece of material in one operation, torn ing the blank for half the heed into 2 cont cal shaped halt hood section and flaring a portion of the blank for the half apron forming a halt apron section, and joining other similar parts therewitl'i. to provide 1.1 complete ventilator hood and apron.

In testimony whereof I have signed my name to this specification in the presence of? two subscribing Witnesses. v v

WALTER REENSIROM.

Witnesses:

JOsI-IUA R. H. Poms B. G. RICHARDS. 

